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为了弥补新骨料、再生骨料的缺陷,充分利用硅粉的填充及纤维的拉结功能,进行了5根再生混凝土与1根普通混凝土框架柱的低周反复加载试验,主要变量为混凝土掺合料(硅粉、混杂纤维)种类及其掺量,并分组对比了不同的硅粉及纤维掺量对改性再生混凝土柱滞回能力、承载力、变形、刚度及耗能的影响规律。结果表明:低掺量硅粉的掺入能够提高再生混凝土柱早期的承载力及变形能力,降低早期刚度,使后期各量值衰减速率随掺量的增加而加快;纤维的掺加使硅粉改性柱的承载力、变形能力及初始刚度均得到大幅提高,承载力、耗能衰减变缓,刚度衰减加快,且此衰减程度与纤维掺入比例有关。因此,必存在一个最适掺入量,使混掺硅粉及纤维的改性再生混凝土柱达到最好的抗震效果,两者的混合比例还有待进一步的试验验证。
In order to make up for the defects of new aggregates and recycled aggregates and make full use of the filling of silica fume and the fiber pull-in function, low-cycle repeated loading tests of five regenerated concrete and one ordinary concrete frame column were carried out. The main variables were: (Silica fume, hybrid fiber) types and their dosages were compared. The effects of different silica fume and fiber dosages on the hysteretic capacity, bearing capacity, deformation, stiffness and energy dissipation of modified recycled concrete columns were compared. The results show that the incorporation of low content of silicon powder can improve the early bearing capacity and deformation capacity of recycled concrete columns and reduce the early stiffness, so that the decay rate of each value accelerates with the increase of dosage. The load-carrying capacity, deformation capacity and initial stiffness of the modified columns have been greatly improved, the bearing capacity, energy dissipation attenuation slowed down, stiffness attenuation accelerated, and the degree of attenuation related to the fiber incorporation ratio. Therefore, there must be an optimum amount of incorporation so that the mixed recycled silica fume and fiber reinforced recycled concrete columns to achieve the best seismic effect, the mixing ratio of the two to be further tested.